Derivatives and Hedging Activities (Income Statement) (Details 2) - Derivatives not designated as hedging instruments [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net investment income [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	$ (16)	$ (1)	$ (16)
Net investment income [Member] | Interest rate contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(21)	1	2
Net investment income [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	0	(4)	(17)
Net investment income [Member] | Foreign exchange contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	4	2	(2)
Net investment income [Member] | Other contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	1	0	1
Banking and deposit interest expense [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	0	0	1
Banking and deposit interest expense [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	0	3	7
Banking and deposit interest expense [Member] | SMC embedded derivatives [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	0	(3)	(6)
Distribution expenses [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	0	8	9
Distribution expenses [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	1	13	9
Distribution expenses [Member] | Foreign exchange contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(1)	(5)	0
Interest credited to fixed accounts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(17)	(8)	(5)
Interest credited to fixed accounts [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(10)	21	14
Interest credited to fixed accounts [Member] | IUL embedded derivatives [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(8)	(27)	(16)
Interest credited to fixed accounts [Member] | EIA embedded derivatives [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	1	(2)	(3)
Benefits, claims, losses and settlement expenses [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(450)	(290)	(428)
Benefits, claims, losses and settlement expenses [Member] | Interest rate contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	241	1,122	(742)
Benefits, claims, losses and settlement expenses [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(304)	(304)	(1,084)
Benefits, claims, losses and settlement expenses [Member] | Credit contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(1)	(33)	6
Benefits, claims, losses and settlement expenses [Member] | Foreign exchange contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	13	(9)	26
Benefits, claims, losses and settlement expenses [Member] | Other contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(27)	(12)	(42)
Benefits, claims, losses and settlement expenses [Member] | GMWB and GMAB embedded derivatives [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	(372)	(1,054)	1,408
General and administrative expense [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	0	3	5
General and administrative expense [Member] | Equity contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	2	4	5
General and administrative expense [Member] | Foreign exchange contracts [Member]
Summary of the impact of derivatives not designated as hedging instruments on the Consolidated Statements of Operations
Amount of gain (loss) on derivatives recognized in Income	$ (2)	$ (1)	$ 0